Last night' debate averaged 5.4 million total viewers and 1.7 million adults 25-54 between 8-10p. That's CNN's best debate result with adults 25-54 and second best result with total viewers. Among cable debates that trails Fox News' Iowa Debate with total viewers and adults 25-54, and Fox News' Florida debate in total viewers. Of all debates for this season, CNN's was 10th out of 18: